CN115369320A - High-performance low-density thin plate for marine equipment and preparation method thereof - Google Patents

High-performance low-density thin plate for marine equipment and preparation method thereof Download PDF

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CN115369320A
CN115369320A CN202210957568.7A CN202210957568A CN115369320A CN 115369320 A CN115369320 A CN 115369320A CN 202210957568 A CN202210957568 A CN 202210957568A CN 115369320 A CN115369320 A CN 115369320A
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sheet
density
marine equipment
performance low
low
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CN115369320B (en
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王学敏
尚学良
王学林
尚成嘉
刘文乐
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Yangjiang Alloy Material Laboratory
University of Science and Technology Beijing USTB
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Yangjiang Alloy Material Laboratory
University of Science and Technology Beijing USTB
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/002—Heat treatment of ferrous alloys containing Cr
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0236—Cold rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0273—Final recrystallisation annealing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

The invention provides a method for preparing a high-performance low-density sheet for marine equipment, which belongs to the field of metal alloys and comprises the following components in percentage by weight: 0.16 to 0.32%, mn:0.5 to 1.5%, al + Cr:2.6 to 5.5%, ti:0.001 to 0.025%, si:0.1 to 0.8 percent, and the balance of Fe and inevitable impurities. The invention forms the corrosion-resistant low-density sheet with good strength and plasticity by rolling process and recrystallization annealing refined crystal grains, and the crystal grains can be refined to several microns by using recrystallization tempering, and the temperature range of the tempering is 600-780 ℃. The yield strength of the prepared sheet is more than 355Mpa, the elongation after fracture is more than 40%, and the grain size of the rolled sheet can reach 1-20 μm. The sheet has good corrosion resistance, and can be used for container body plates of coastal ports.

Description

High-performance low-density thin plate for marine equipment and preparation method thereof
Technical Field
The invention belongs to the field of metal alloy, and relates to a preparation method of a low-density sheet.
Background
In recent years, with the development of economy and society, the environmental pollution temperature is increasingly prominent, energy conservation and emission reduction, green and environmental protection are realized, and the development of ocean economy becomes the main melody of the current society development. The steel material is used as a support for national economic development and plays a very important role in the progress of human progress and social development. In order to adapt to the trend, green economy, energy conservation and emission reduction are developed, the lightweight is realized by generally adopting the steps of improving the performance of steel and reducing the density of materials, and CO is reduced 2 And (4) discharging. The ocean resources are abundant and have huge reserves in the world, and the development and the use of the ocean resources have important significance on the sustainable development of human society. With the development and utilization of marine resources, the demand for steel for marine facilities is increasing. But the marine environment is humid and Cl - The content is high, and the development of low-density high-performance corrosion-resistant ocean engineering steel is the research and development focus of the steel industry at present. Al is added into the steel material as a low-density element, so that the density of the steel can be effectively reduced, and the corrosion resistance of the steel can be improved by adding the Al element. The composite addition of the elements Al and Cr can not only reduce the density of the steel material, but also effectively improve the Cl content of the metal material - In a content environmentAnd (5) service life.
Disclosure of Invention
The invention aims to provide a preparation method of a high-performance low-density sheet for marine equipment, which is characterized in that a corrosion-resistant low-density sheet with good strength and plasticity is formed by refining grains through alloy component design, a rolling process and recrystallization annealing, and the grains are refined to be several microns by using recrystallization tempering, so that the high-performance corrosion-resistant low-density sheet is obtained.
The high-performance low-density thin plate for the marine equipment comprises the following chemical components in percentage by weight: c:0.16 to 0.32%, mn:0.5 to 1.5%, al + Cr:2.6 to 5.5%, ti:0.001 to 0.025%, si:0.1 to 0.8 percent, and the balance of Fe and inevitable impurities.
The optimal rolled plate comprises the following chemical components: c:0.22%, mn:1.5%, al + Cr:3.5%, ti:0.015%, si:0.38%, and the balance of Fe and inevitable impurities.
The preparation method of the high-performance low-density sheet for the marine equipment comprises the steps of carrying out hot rolling at the finishing rolling temperature of more than 800 ℃, carrying out hot rolling to obtain a rolled sheet with the thickness of 3-5mm, carrying out cold rolling to obtain a rolled sheet with the thickness of 1.6-2.2mm, carrying out low-temperature tempering on the cold rolled sheet, heating to 550-780 ℃, carrying out heat preservation for 20-150 min, and carrying out water cooling to obtain the high-performance low-density sheet.
The invention has the characteristics and advantages that: the corrosion-resistant low-density thin plate with good strength and plasticity is formed through composition design and recrystallization annealing. The excellent mechanical properties are mainly caused by grain refinement, which can be refined to 1-20 μm after complete recrystallization. The tempering temperature is controlled to be 600-780 ℃ (Ac 1), the optimal tempering temperature is 700 ℃, crystal grains can be effectively refined, and the performance of the sheet is improved. The alloy elements Al and Cr can generate compact oxide film on the metal surface, and improve the moisture and high Cl of the rolled plate - Corrosion resistance in a content environment. The yield strength of the prepared sheet is more than 355Mpa, the elongation after fracture is more than 40%, and the grain size of the rolled sheet can reach 1-20 μm. The density of the designed experimental steel is measured to be 7.56-7.62 g/cm by using a DahomeMeter multifunctional density tester 3 。
Description of the drawings:
FIG. 1 is a sheet rolling process;
FIG. 2 is a stress-strain curve of a sheet under different conditions;
FIG. 3 is a photograph of the microstructure of the sheet after tempering at 700 ℃ for 60 min.
The specific implementation mode is as follows:
according to the chemical composition design of the invention, various components are added into a vacuum melting furnace to be melted, the molten liquid is taken out of the furnace and poured when the temperature of the molten liquid reaches 1550-1600 ℃, the chemical compositions of the molten liquid are analyzed when the molten liquid is cooled to room temperature, and the chemical composition results are shown in table 1.
Table 1 composition (wt.%) of test steel of the invention
Figure BDA0003791975150000021
Heating the cast ingot to 1250 ℃, preserving heat for 120min, forging the cast ingot into a billet with the thickness of 120mm, and cooling the billet to room temperature in air. Heating 120mm steel billet to 1200 ℃ and preserving the temperature for 180min. Two-stage multi-pass controlled rolling is adopted, hot rolling is carried out until the thickness is 4mm, the initial rolling temperature of the first stage of hot rolling is 1200 ℃, and the final rolling temperature is more than 1100 ℃; the second stage has the initial rolling temperature of 950 ℃ and the final rolling temperature higher than 800 ℃. And (3) after the hot rolling is finished, keeping the temperature at 800 ℃ for 60min, cooling to room temperature by water, performing cold rolling, and then performing cold rolling to 2mm. The rolling process is shown in figure 1.
The cold rolled sheet was tempered at 600 deg.C, 650 deg.C, 700 deg.C, and 750 deg.C, and the properties after tempering are shown in Table 2.
TABLE 2 mechanical properties of the sample steels in different states
Figure BDA0003791975150000031
TABLE 3 pitting corrosion resistance, corrosion rate g/m, of examples of the present invention 2 h (test standard GB/T17897-2016)
Figure BDA0003791975150000032
As can be seen from FIG. 2, the yield strengths of the cold-rolled sheets after tempering at different temperatures are all above 355MPa, and the yield plateaus appear at some temperatures, which shows that the toughness and the deep drawing performance of the cold-rolled sheets after tempering are improved to some extent. As can be seen from FIG. 3, the experimental steel can be completely recrystallized after the cold-rolled sheet is tempered at 700 ℃, and the structure is single-phase ferrite grains with the grain size of 1-20 μm.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims (4)

1. The high-performance low-density thin plate for the marine equipment is characterized by comprising the following chemical components in percentage by weight: 0.16 to 0.32%, mn:0.5 to 1.5%, al + Cr:2.6 to 5.5%, ti:0.001 to 0.025%, si:0.1 to 0.8 percent, and the balance of Fe and inevitable impurities.
2. The high-performance low-density sheet for marine equipment as claimed in claim 1, wherein the chemical composition of the sheet is as follows by weight percent: c:0.22%, mn:1.5%, al + Cr:3.5%, ti:0.015%, si:0.38%, and the balance of Fe and inevitable impurities.
3. The method for preparing the high-performance low-density sheet for the marine equipment as claimed in claim 1 or 2, wherein the hot rolling finish rolling temperature is higher than 800 ℃, the thickness of the hot-rolled sheet is 3-5mm, then the cold rolling is carried out, the thickness of the cold-rolled sheet is 1.6-2.2mm, then the cold-rolled sheet is tempered at low temperature, heated to 600-780 ℃, kept for 20-150 min, and cooled by water, and the high-performance low-density sheet is obtained.
4. The high-performance low-density sheet for marine equipment as claimed in claim 1 or 3, wherein the yield strength is more than 355Mpa, the elongation after fracture is more than 40%, and the grain size of the rolled sheet is 1 to 20 μm.
CN202210957568.7A 2022-08-10 2022-08-10 High-performance low-density sheet for marine equipment and preparation method thereof Active CN115369320B (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090277547A1 (en) * 2006-07-14 2009-11-12 Kabushiki Kaisha Kobe Seiko Sho High-strength steel sheets and processes for production of the same
CN103484771A (en) * 2013-10-18 2014-01-01 北京科技大学 High-aluminum low-density medium-thickness steel plate for ocean platform and preparation method thereof
CN104928569A (en) * 2015-06-30 2015-09-23 宝山钢铁股份有限公司 800MPa grade high-ductility low-density steel and manufacturing method thereof
CN107429369A (en) * 2015-02-24 2017-12-01 新日铁住金株式会社 Cold-rolled steel sheet and its manufacture method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090277547A1 (en) * 2006-07-14 2009-11-12 Kabushiki Kaisha Kobe Seiko Sho High-strength steel sheets and processes for production of the same
CN103484771A (en) * 2013-10-18 2014-01-01 北京科技大学 High-aluminum low-density medium-thickness steel plate for ocean platform and preparation method thereof
CN107429369A (en) * 2015-02-24 2017-12-01 新日铁住金株式会社 Cold-rolled steel sheet and its manufacture method
CN104928569A (en) * 2015-06-30 2015-09-23 宝山钢铁股份有限公司 800MPa grade high-ductility low-density steel and manufacturing method thereof

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